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Last seen: presque 3 ans il y a | Actif depuis 2012

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Biometric modality quality metric validation/evaluation.
An implementation of the validation of a biometric quality metric.

plus de 8 ans il y a | 1 téléchargement |

Question

how can show a 3-D plot of grayscale values for a fingerprint image
Hello, I want to that described in the title. How can I calculate the 3rd values. Is that the gradient or something else? Thank...

plus de 9 ans il y a | 1 réponse | 0

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réponse

Question

binary file operations write and read
Hello, I am trying to write some 2D coordinates into a binary file. However, what I read from the file that had been writen i...

presque 10 ans il y a | 1 réponse | 0

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réponse

Question

how can I obtain the coordinates of the polygon border pixels
Hello, For example, there is an image on which I have a set of points and the vertices of the convex hull of these points. We...

presque 10 ans il y a | 1 réponse | 0

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réponse

Question

How can I know some special points according to the 'probplot'
For example, I have a group of points in 2D plane. Then, I make a probplot (normal) of them. p = [xi, yi] i = 1, ..., N...

environ 10 ans il y a | 1 réponse | 0

0

réponse

Question

To calculate or estimate a center of a convex hull
I am trying to find a center or estimated center of a convex hull of a set of points. In Matlab, we can obtain the convex hull o...

environ 10 ans il y a | 2 réponses | 0

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réponses

Réponse apportée
To calculate the angles of the Delaunay triangles
Thank you guys.

environ 10 ans il y a | 0

Question

To calculate the angles of the Delaunay triangles
I am trying to calculate the 3 angles of each triangle generated by Delaunay triangulation. For example, I have already obtained...

environ 10 ans il y a | 3 réponses | 0

3

réponses

Question

Distance between image block and image centroid of fingerprint
I want to calculate the distance between each block centered at (xi, yi) and the centroid of fingerprint image located at (xc, y...

plus de 10 ans il y a | 1 réponse | 0

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réponse

Question

How I can configure Borland C++ in 2011a
I am using Matlab2011a. I want to compile a external toolbox which needs to use Borland C++. But Matlab doesn't seem to support ...

plus de 10 ans il y a | 1 réponse | 0

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réponse

Question

How can I calculate the perimeters of Delaunay triangles?
Hello, Assume I have a set of point coordinates in a 2D plane. x = [ 16 16 16 17 18 19 19 20 21 2...

plus de 10 ans il y a | 1 réponse | 0

1

réponse

Question

(question about biometrics) What is the difference between these ROC curves?
Hello, I am reading something about ROC curve. And I found that the curve is different given in different publications. So, I...

plus de 10 ans il y a | 1 réponse | 0

1

réponse

Question

how I can use gaussian mixture model to calculate a statistical value
Hello, I have a set of spacial point, i.e. coordinate (x,y) of each point. I want to use the gaussian mixture model. But, how...

environ 11 ans il y a | 1 réponse | 0

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réponse

Question

how can I draw a grid over a specified region of the image
For example, I have an image of 400*360. I want to draw small grids over a region of the image. E.g. draw small grids of 20*20 ...

environ 11 ans il y a | 1 réponse | 0

1

réponse

Question

how I can analyze this magnitude of 1D signal
This is a DFT magnitude graph of a set of 1D points. How can I analyze it? Can I say that the lowest frequency contribute most ...

environ 11 ans il y a | 2 réponses | 1

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réponses

Question

How can I calculate a dirac function of 2D discrete signal
For example, I have 20 2D points, as the input signal. (xi, yi) i = 1...Z , Assume that Z = 20, i.e. 20 points. How can I cal...

environ 11 ans il y a | 2 réponses | 0

2

réponses

Question

how can I calculate this joint distribution
Suppose that one object has two properties, and they are two discrete variable, as X and Y. The population number of both X and ...

environ 11 ans il y a | 1 réponse | 0

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Question

a series of point coordinates are known, and their orientation (angle). Calculate gradient
For example, 10 points' coordinates are known, as (xi, yi) i =1 ... 10 and a corresponding angle of each point is known, as ai ...

environ 11 ans il y a | 1 réponse | 0

1

réponse

Question

about the calculation of phase spectrum for a set of coordinates
I want to implement an approach for calculating Phase spectrum of a set of coordinates. In the paper, it is described as 3 equat...

environ 11 ans il y a | 1 réponse | 0

1

réponse

Question

about calculating a measure of an image feature vector
Hello, I want to ask a question about calculating a measurement of an image feature vector. For an image, several feature w...

environ 11 ans il y a | 1 réponse | 0

1

réponse

Réponse apportée
Why my calculation of standard deviation of an image is different from the built-in function
thank you all, guys.

plus de 11 ans il y a | 0

Réponse apportée
Why my calculation of standard deviation of an image is different from the built-in function
However, I found where the problem happens. If I calculate standard deviation of an image without converting it into double, i...

plus de 11 ans il y a | 0

Question

Why my calculation of standard deviation of an image is different from the built-in function
Hello, My code is shown below, and I opened the built-in function. I found it just calculates the square root or variance. S...

plus de 11 ans il y a | 4 réponses | 0

4

réponses

Question

Ask questions about Gabor filter's parameters
I am trying to implement a 2D Gabor filter, but I don't understand several parameters of this filter. For example, I use a g...